Seen on an ordinary day in downtown London, this footage is the last captured of Hans and Eva Rausing together just a few weeks before she was tragically found dead at their mansion.

The super-rich couple, who have a well documented history of drug abuse, were filmed by an onlooker making a rare appearance outdoors in upmarket Chelsea, west London as the £4.5billion Tetra Pak heir dropped his wife Eva, 48, off at the dentist.

The pictures show vividly how badly the couple had declined and they were in a state of some confusion as they made their way onto the pavement in the bright sunshine after pulling up in an old Mercedes.

What happens after provides evidence of how far the couple had slumped - and how much help they were in obvious need of.

The footage emerged as news broke that Mr Rausing has been arrested on suspicion of her murder. He is still not fit to be questioned by detectives and remains in a secure medical facility.

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Confused: Footage shows Eva Rausing shuffling along a pavement unsteadily to visit the dentist in Chelsea

Dishevelled: Mrs Rausing has a brief conversation with her unkempt-looking husband after he drops her off

Unsteady: Mr Rausing opens the door of his old Mercedes parked awkwardly on the roadside before driving off

The short video clip, filmed at about 1.30pm
one day at the beginning of May, shows the dishevelled and confused
mother-of-four, shuffling along the pavement after being dropped off by
her unkempt-looking husband.

Hiding her eyes behind dark glasses, her blonde hair in her face, a fragile-looking Mrs Rausing wanders unsteadily along the pavement carrying a small brown handbag and gripping her mobile phone. Dressed in bright pink cropped trousers, a white shirt and dark coat that appears too large for her tiny frame, she repeatedly touches her nose and flicks her hair.

A pale-looking Mr Rausing, 49,
cut a worrying shape too as he pulled up awkwardly on double-yellow
lines, more than a foot from the kerb in an old left-hand-drive
Mercedes, dressed in a brown jacket and scruffy T-shirt.

He looked disorientated as he stepped into the busy stream of traffic, opening the car door for his wife.

The pair had a brief conversation before he clumsily pointed her in the direction of the dentist before he clambered back behind the wheel, gripping the car door to steady himself, and driving off.

An onlooker said: 'Mrs Rausing clearly didn't look very well, she was very unsteady on her feet. He was stumbling about too - you wouldn't have wanted to get behind the wheel with him.'

Commenting on the video, Cosmo Duff Gordon, founder of the Start2Stop outpatient addiction treatment programme told Mail Online: 'Mr Rausing looks unkempt and appeared to have markedly jerky, poorly co-ordinated movements, somewhat out of synch with things around him.

'As he holds onto the car door to steady himself, it is also noticeable that his mouth and jaw seem quite slack.

'Mrs Rausing seems, like millions of people, to be quite intent on texting someone. Her appearance is much smarter than her husband’s, but she is not walking with any purpose: she seems to be listing and unsteady.

'She also repeatedly does something to her right cheek, which appears unusual.'

'Mr Rausing’s appearance (gaunt, unkempt, jerky yet slowed down, clutching onto the car door) would seem to be consistent with someone who was using drugs. Mrs Rausing, on the other hand, is behaving rather more ‘normally’, and not necessarily in a way attributable to substance use.'

The effects of...

HEROIN

Heroin is a depressant, a narcotic whose use creates around a 200 per cent spike in dopamine levels.

The effects of narcotic opiates on consciousness are complex. Drowsy, cloudy, feelings occur because opiates depress the activity of parts of the cerebral cortex. But they also produce excitation in other parts, leading users to experience a sense of euphoria.

Heroin addicts are likely to manifest the following constellation of symptoms: dirty and unkempt appearance (heroin addicts develop an aversion to water and will go lengthy periods of time without bathing or washing); teeth problems (unlikely to see dentists); endocarditis (see below; bacterial infection of the heart valves, one symptom of which is unsteadiness); very pale (lowered blood pressure); lethargic and amotivated (won’t do much; the relationship with heroin is a full-time one).

Horror: Heroin takes complete control of a person's life

When stoned, likely to ‘nod out’ --- or fall asleep mid-sentence.

If an intravenous heroin user, likely to go through veins in arms and legs and then use veins in groin and neck. Likely to have numerous abscesses requiring courses of antibiotics.

Very low sex drive and highly constipated; may not pass stools for many days at a time.

However, once the initial rush of a ‘hit’ has passed (maybe after 30 minutes for an IV user), the heroin addict may be quite lucid and often able to hide their addiction and meet the demands of sometimes quite exacting jobs.

The effects of...

CRACK COCAINE

Crack, a purer and stronger form of cocaine, is a powerful stimulant, whose effect is to increase behavioural activity, engendering a sense of alertness, energy, pleasure and euphoria.

Studies suggest that it stimulates around a 450 per cent spike in production of dopamine.

Crack addicts will become hyper alert, often staying up for days at a time, very edgy and have a restless, jagged, energy.

Pupils will be dilated and self-care will be poor.

Crack addiction can cause psychosis (not the case with heroin addiction) and many crack users will psychotically pick at their skin for imaginary bugs/insects/spiders.

Others will have psychotic and paranoid delusions where they think they are being followed, spied on by police hiding in the walls, etc.

Crack addicts will lose their normal sleeping pattern and be on high alert

Crack will also, for many users, cause them to engage in high-risk sex.

Being a powerful stimulant, crack inhibits hunger, which means that crack addicts will tend to eat very little while on binges and become quite emaciated.

Once caught in a crack addiction spiral, the only thing that ends the binge for most addicts is running out of money --- if one has access to an endless source of money, it is hard to imagine the binge stopping without an external intervention or the user experiencing an existential crisis.

When heroin and crack are used together (‘speedballs’) the interaction is incredibly powerful and drives an acceleration of the addictive process and consequent losses/problems/unmanageability.

Psychotherapist and counsellor Adrianna Irvine added: 'If the man in this video is the same man in an earlier picture of Mr Rausing, his evident decline is quite awful.

The woman in the video & pictures of Mrs Rausing show an equally awful decline.

'They do each appear to be under the influence of either drugs or alcohol or both. Of course, it may transpire that they were both on legally prescribed medication, such as methadone or who knows what.

'The Rausings have had their drug use documented & if this is them in this video, or whoever it is, I would comment that they both seem to be in a state of quite advanced addiction.'

One of Britain's richest women, Mrs Rausing is believed to have
visited an upmarket dentist in Sloane Street, Chelsea, for treatment for
an abscess.

Treatment: Mr Rausing talks to his wife briefly before she visited the dentist for treatment for an abscess

She
was in the dentist for around 10 minutes before she reappeared and
wandered back home to their £70million Belgravia mansion in Cadogan Place.

It was here that she was found dead in an upstairs bedroom on Monday when police carried out a search
after her husband was arrested in possession of Class A drugs while
driving erratically in South London.

The fabulously rich couple are said
to have existed in virtual squalor in just two rooms of the house as
they battled long-term drug problems.

Decline: Another picture of the couple who were pictured looking scruffy and confused just weeks before Mrs Rausing was found dead on Monday and there are suggestions her body had been there for three or four days

Drug den: Despite living in this vast £70million Belgravia mansion, the couple - who had fought a long battle with addiction to hard drugs - had become increasingly reclusive, confining themselves to two squalid rooms

A post-mortem has been carried out by Home Office pathologist Nat Carey, in the presence of defence pathologist Simon Poole, but no obvious cause of death has been found. Further tests including toxicology are pending.

Mr Rausing was arrested by police on Monday, July 9 in Wandsworth, south London after police suspected he had been under the influence of drink or drugs.

They searched his car and a small amount of drugs were discovered. Police were then granted permission to search the couple's home where they discovered Mrs Rausing's body. Scotland Yard would not comment on whether Class A drugs were found at the house.

Inquest: Pictures of Eva Rausing from her MySpace page. A post-mortem examination has concluded no obvious cause of death has been found and further tests including toxicology are pending

Billionaire Hans Kristian Rausing, pictured with his wife a few years ago, may have lived with his wife Eva's dead body for up to four days before it was discovered by police it has been claimed

Mr Rausing was first arrested on drugs charges and then later re-arrested on suspicion of murder when his wife's body was found.

The inquest into her death was opened
today. Detective Inspector Sharon Marman told Westminster Coroner's
Court: 'We have not yet been in a position to interview Mr Rausing. He
has been arrested on suspicion of her murder and we await notification
of when he would be fit to be interviewed by police.'

HEROIN AND THE HEART

Having a heart valve replaced is quite unusual for someone who was relatively young, but not that unusual for heroin addicts.

Long-term junkies will often run out of veins on their arms and legs, and have to inject into the groin.

Driven by desperation for the drug, their injecting practices are usually unsafe and unhygienic.

Many intravenous heroin users develop endocarditis, which is a bacterial infection of the heart valves.

However,
because hardened heroin addicts are likely to continue with intravenous
heroin use, the endocarditis will often kill them in the end.

Scotland Yard officers need to find
out if, as has
been suggested, he lived in their house for three
or four days while her body was in the house.

They are also trying to
trace a drug dealer in the Wandsworth area of South London.

Police
are also examining CCTV footage to track the couple’s movements as well
as those of anyone entering or leaving the Cadogan Place house where
they had lived for 13 years.

Their
bank records are also being looked at and detectives, assisted by
specialists, are studying what are described as Mrs Rausing’s ‘long and
extremely complicated medical records’ for clues as to what led to the
death.

Yesterday, Mrs Rausing's mother revealed her daughter flew home from a drugs rehabilitation centre in
the United States in the days before her death after her husband failed
to join her as planned.

Nancy
Kemeny believes her daughter – who had a pacemaker after
having a heart valve replaced – died from heart problems triggered by
the flight to London.

She
said Mrs Rausing had come home to try to persuade her husband to
join her for treatment.

THE HORRIBLE TRUTH ABOUT ADDICTION

Leading psychotherapist and counsellor ADRIANNA IRVINE says...

Given the known facts so far, Mrs Rausing's family have commented that she had just returned from a rehabilitation centre in the US as her husband had not joined her.

Without knowing their personal circumstances, I can only comment that if one person in a couple tries to get into recovery, cleans up and stops using drugs and alcohol, but the other doesn't, it's incredibly difficult to stay clean and sober.

Of course, at that point, I would be looking to see if there is a relationship addiction, or what's called a 'process addiction' as a separate issue from 'substance addictions'.

Tragic: Addiction seems to have triumphed in the case of the Rausings

It's my experience that, often, addicts find each other and if an addict cannot stay clean and sober, then there is a process addiction working (which is relationships, co-dependence, sex and love addiction, food, money) or a mental health issue or both.

The drugs and alcohol are horrendous addictions in themselves but they are evident and obvious.

The relationship addictions are not, unless you know what you are looking for. Sex addiction is beginning to be noticed but other aspects of this are much less known or commented upon and so this is the most un-noticed & perhaps the most difficult to explain.

It will have it roots in much, much earlier behaviours and environments than any of the substances as we are conceived in relationship and so that begins before anythings else.

The man clearly, no matter what state he is in, has gone round to the passenger side of the car to escort the woman out and onto the pavement. Or so it looks.

This is old fashioned and quite chivalrous and I believe illustrates love and care who knows, perhaps control also.

I cannot comment on subsequent events with regards to the Rausings because we simply do not know yet - but I would say that any form of addiction is horrendous and such a terrible end is really tragic.

He may be alive but he's clearly very ill and while addiction is never, ever an 'excuse' for anything, it is so often the reason.

It's a very sad story, whatever the details. And there is treatment and there is a solution.